Pass Size as a 2nd argument for snprintf() in tablesync.c.

Previously the following snprintf() wrappers:

* ReplicationSlotNameForTablesync()
* ReplicationOriginNameForTablesync()

... used int as a second argument of snprintf() while the actual type of it
is size_t. Although it doesn't fail at present better replace it with Size
for consistency with the rest of the system.

Author: Aleksander Alekseev
Reviewed-By: Peter Smith
Discussion: https://postgr.es/m/CAHut%2BPsa8hhfSE6ozUK-ih7GkQziAVAf4f3bqiXEj2nQiu-43g%40mail.gmail.com

src/backend/replication/logical/tablesync.c

@@ -1187,7 +1187,7 @@ copy_table(Relation rel)
  */
 void
 ReplicationSlotNameForTablesync(Oid suboid, Oid relid,
-								char *syncslotname, int szslot)
+								char *syncslotname, Size szslot)
 {
 	snprintf(syncslotname, szslot, "pg_%u_sync_%u_" UINT64_FORMAT, suboid,
 			 relid, GetSystemIdentifier());
@@ -1200,7 +1200,7 @@ ReplicationSlotNameForTablesync(Oid suboid, Oid relid,
  */
 void
 ReplicationOriginNameForTablesync(Oid suboid, Oid relid,
-								  char *originname, int szorgname)
+								  char *originname, Size szorgname)
 {
 	snprintf(originname, szorgname, "pg_%u_%u", suboid, relid);
 }